[Bug middle-end/67338] fold-const sanitizer runtime error in roundup_loc

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67338

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Tue Mar 21 08:10:30 2017
New Revision: 246305

URL: https://gcc.gnu.org/viewcvs?rev=246305&root=gcc&view=rev
Log:
        PR c/67338
        * fold-const.c (round_up_loc): Negate divisor in unsigned type to
        avoid UB.

        * gcc.dg/pr67338.c: New test.

Added:
    trunk/gcc/testsuite/gcc.dg/pr67338.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/fold-const.c
    trunk/gcc/testsuite/ChangeLog